To remove the “curling” effect, simply unroll your magnet and place it on a flat surface in a warm environment. Allow your magnet time to warm up. You can speed up the process by using a hair dryer and applying light heat to your magnet. Heat will cause a “softening” effect. The softer the magnet, the more malleable it becomes.
How do I remove the “curling” effect caused by my magnet having been rolled up?